<div class="alert alert-warning alert-dismissible" role="alert">
    <button type="button" class="close" data-dismiss="alert" aria-label="Close">
        <span aria-hidden="true">&times;</span>
    </button>
    请<%= link_to "加入小组", groups_path %> 或者 <%= link_to "创建小组", new_group_path %> 才能使用完整的功能
</div>